class_docstr: Write values to mask of zero-initialized array
class_docstr_tok: ["Write","values","to","mask","of","zero-initialized","array"]
code: def __init__(self, mask):
      self.mask = mask
  
file_path: chainer/chainer/functions/normalization/l2_normalization.py
imports: import six
  from chainer import backend
  from chainer import function_node
  import chainer.functions
  from chainer import utils
  from chainer.utils import type_check
label_desc: Use image node_id 1 to create a new _SetItemZero object from inherited base classes: function_node with example: obj = _SetItemZero(mask)